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1. For post and photos, you need copy all jomsocial tables and users table from Joomla itself, you can ignore the rest tables record if you dont need them.. for photos you need to copy all files inside folder /images/
2.For translation, you can copy the old one from folder /language/ your modified translation will be fine
Thank you for your explanation. Once precision however . Does the jomsocial tables are the ones that start with " _community " or is it that there are others who start with a different name ?